delete thumbnail cache
I can't see the thumbnails in my project line. forgot the path to delete these files so they reappear.
macbpro, fcp7 g drive, Mac OS X (10.6.4)
You can set them to be anywhere so there's no single answer.
Open FCP and go to System Settings > Scratch Disks.
It will show you the path...
Mine are at the top level of a particular drive. If yours are in a subfolder somewhere it will also show the directory path with the usual / separators.